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framebuffer rotate display when SGX Powervr driver accelerated



hi

recently I follow the wiki link (http://processors.wiki.ti.com/index.php/Building_Qt_for_OMAP35xx_with_OpenGL_ES_accelerated_by_SGX )

the Qt demo show normally at LCD output, but if when I enable omapfb overlay with bootcmd :

omapfb.rotate=1  omapfb.rotate_type=1 omap_vout.vid1_static_vrfb_alloc=y

and run the demo with: ./sitara -qws -display powervr

the display is messed, some messed color window just display at the top of LCD screen. 

but if run it with ./sitara -qws , it is ok

I run it at beagleboard compatible devkit8000.

is there any conflict between powervr driver with omapfb rotated driver?

how to resolve it? can you give some advice?